I'm ready to start playing with ST3 (even though not all my favorite plugins work, sigh), just deployed a large app and am ready to update my development environment.

But before I install ST3, I wanted to ask if is a separate install or an in-place install? Can I keep both on my system for the time being? I want to keep running ST2 around until I'm ready to use ST3 full time, but want to start getting ST3 setup.